JP5782689B2 - Conveying apparatus and recording apparatus - Google Patents

Description

  The present invention relates to a transport apparatus having a function of correcting curling of a sheet-like medium such as roll paper, and a recording apparatus including the transport apparatus.

  2. Description of the Related Art Conventionally, a printer that is a type of recording apparatus includes a print head (recording unit) that performs a recording process on roll paper (sheet-like medium), and a decurling mechanism for correcting curl (rolling) of the roll paper. (For example, Patent Document 1).

  The decurling mechanism disclosed in Patent Document 1 is disposed and transported upstream of the transport roller in the transport direction of the roll paper, a transport roller that transports the roll paper, a decal roller that sandwiches the roll paper between the transport rollers. And a free roller (driven roller) that rotates in conjunction with the movement of the roll paper. Then, in a state where the roll paper is sandwiched between the transport roller and the decurling roller, the curl is corrected by bending between the sandwiched portion and the portion engaged with the free roller. It was.

JP 2009-179416 A

  By the way, in patent document 1, the conveyance roller pair was provided in the upstream of the free roller in the conveyance direction. When the roll paper is transported on the peripheral surface of the free roller by the transport roller pair, the free roller is driven by the roll paper and rotates to guide the roll paper toward the transport roller. It was. However, if the leading edge of the roll paper conveyed away from the pair of conveying rollers is curled, the curled leading edge is caught by the free roller before the roll paper is supported by the free roller. There was a case. And when the front end side portion of the roll paper is caught by the free roller in this way, there is a problem that the roll paper is poorly conveyed.

  The present invention has been made to solve the above-described problems, and its purpose is to generate a conveyance failure due to curling of the sheet-like medium when the sheet-like medium is conveyed for performing curl correction processing. It is an object of the present invention to provide a transport apparatus that can suppress the above-described problem and a recording apparatus including the transport apparatus.

  In order to achieve the above object, the transport device of the present invention includes a first drive roller that transports a sheet-like medium from an upstream side to a downstream side in the transport direction along the transport path, and the first drive roller in the transport direction. When the sheet-shaped medium is sandwiched between the second drive roller that is disposed upstream of the first drive roller and conveys the sheet-shaped medium toward the first drive roller, the sheet-shaped medium A curl correction roller that rotates following the conveyance of the medium and bends the sheet medium with the second driving roller to correct the curl of the sheet medium.

  According to this configuration, since the second drive roller is arranged on the upstream side in the transport direction of the first drive roller, the second drive roller rotates even when the leading end side of the sheet-like medium is curled. Therefore, it is possible to suppress the catching of the sheet-like medium and reliably convey the leading end portion of the sheet-like medium toward the first drive roller. Therefore, compared with the case where the driven roller is arranged on the upstream side of the first driving roller, when the sheet-like medium is conveyed for performing the curl correction processing, the conveyance failure due to the curl of the sheet-like medium. Can be suppressed.

  In the transport device of the present invention, the curl correction roller is disposed at a position facing the first drive roller across the transport path, and sandwiches the sheet-like medium with the first drive roller. It is possible to move between a correction position and a standby position where the circumferential surface of the curl correction roller is separated from the conveyance path.

  According to this configuration, the curl correction roller can correct the curl of the sheet-like medium when the sheet-like medium is sandwiched between the curl correction roller and the first driving roller. Further, the curl correction roller can pass through the sheet-like medium without being bent by moving from the correction position to the standby position. Therefore, when it is not necessary to correct the curl, the load when the sheet-like medium is conveyed can be reduced by moving the curl correction roller to the standby position.

  The conveying device of the present invention further includes a reversing path forming member that is disposed on the downstream side of the first driving roller in the conveying direction and reverses the sheet-like medium conveyed by the first driving roller. The roller is movable between the standby position that is spaced upward from the first drive roller and the correction position that is upstream of the standby position in the transport direction.

  According to this configuration, when the curl correction roller moves to the correction position, the sheet-like medium is conveyed by the first driving roller so that the leading end side, which is the downstream side in the conveyance direction, is inclined upward. The medium can smoothly enter the reverse path. In addition, when the curl correction roller is a driving roller, the end of the sheet-shaped medium heading upward is wound with the rotation of the driving roller. However, since the curl correction roller is a driven roller, the sheet-shaped medium is It is possible to suppress wrapping around the curl correction roller.

  The transport apparatus according to the present invention further includes a control unit that controls movement of the curl correction roller, and the control unit is configured such that the sheet-like medium is interposed between the curl correction roller and the first drive roller at the standby position. The curl correction roller is moved from the standby position to the correction position.

  According to this configuration, the sheet-like medium can be smoothly inserted between the curl correction roller and the first drive roller by moving the curl correction roller to the standby position. Since the curl correction roller is moved from the standby position to the correction position with the sheet medium inserted between the curl correction roller and the first drive roller, the sheet medium can be securely held.

  In order to achieve the above object, a recording apparatus according to the present invention includes a holding unit that holds a sheet-like medium in a roll-like state, and a sheet-like medium that is unwound from the roll-like body. Recording means for performing recording, and the conveying device.

  According to this structure, the same effect as the said conveying apparatus can be acquired.

FIG. 3 is a cross-sectional view illustrating a schematic configuration of a printer including the conveyance device according to the embodiment. The side view which shows the curl correction mechanism when not performing the curl correction operation. The side view which shows the curl correction mechanism when performing the curl correction operation. The top view which shows the curl correction mechanism when not performing the curl correction operation. The top view which shows the curl correction mechanism when performing the curl correction operation. The perspective view for demonstrating a cam mechanism and a guide member. FIG. 2 is a block diagram illustrating an electrical configuration of the printer according to the embodiment. The flowchart explaining a curl correction process routine. Sectional drawing which shows the modification of a paper discharge part.

Hereinafter, an embodiment in which the present invention is embodied in an ink jet printer (hereinafter sometimes abbreviated as “printer”) which is a kind of recording apparatus will be described.
As shown in FIG. 1, the printer 11 includes a main body case 12 having a paper discharge unit 12a, a holding unit 13 that holds a sheet ST as a sheet-like medium in a roll body RS in a roll shape, and a control. The apparatus 100 (refer FIG. 7) is provided.

  In addition, the printer 11 includes a conveyance device 14 that conveys the sheet ST in the main body case 12 along a conveyance path extending from the holding unit 13 toward the paper discharge unit 12a. Further, in the main body case 12, a recording unit 15 that performs recording on the sheet ST unwound from the roll body RS, and a cutter 16 are provided. Further, on the downstream side of the cutter 16 in the transport direction X, a curl correction mechanism 17 constituting a part of the transport device 14 is provided.

  The sheet ST transported by the transport device 14 is subjected to printing (recording) processing on the surface in the recording unit 15, and a portion printed on the surface is cut by the cutter 16. Then, after the cut end portion of the sheet ST is a cut sheet CS (single sheet recording medium), the curl correction mechanism 17 corrects the curl. In the following description, when expressed as “sheet ST”, a long sheet unwound from the roll body RS, and a sheet cut from the long sheet into a cut sheet CS May be included.

Next, the holding unit 13 will be described.
The holding unit 13 includes a rotation shaft 18 that rotatably supports the roll body RS, and a rotation motor 19 (see FIG. 7) for rotating the rotation shaft 18. When the rotary shaft 18 rotates counterclockwise in FIG. 1 as the rotary motor 19 is driven, the sheet ST is unwound from the roll body RS.

Next, the transport device 14 will be described.
The conveying device 14 transfers the sheet ST between a plurality of conveying rollers 20 to 26 that convey the sheet ST from the upstream side to the downstream side in the conveying direction X, and the conveying rollers 20, 21, 22, 24, 25, 26. And driven rollers 30, 31, 32, 34, 35, and 36 to be sandwiched. The transport rollers 20, 21, 22, 24, 25, and 26 and the driven rollers 30, 31, 32, 34, 35, and 36 are disposed at positions facing each other across the transport path. In the following description, the transport roller 22 and the driven roller 32 that make a pair may be referred to as a transport roller pair R2.

  Further, the transport device 14 includes a transport motor 37 (see FIG. 7) for rotating the transport rollers 20 to 26, a transport path forming member 38 disposed at a position corresponding to the transport roller pair R2, the transport roller 25, An inversion path forming member 39 that forms an inversion path with the conveying roller 26 is provided. As shown in FIG. 7, the output shaft of the transport motor 37 is provided with a rotary encoder 40 and a power transmission switching device 41 for detecting the rotational speed, rotational position, and rotational direction of the output shaft. The power transmission switching device 41 switches the power transmission destination between the conveyance motor 37 and the conveyance rollers 20 to 26 according to the conveyance process of the sheet ST. Note that the conveying roller 25 and the driven roller 35 that make a pair are configured to feed the sheet ST that has passed through the curl correction mechanism 17 to the reversing path, and thus may be referred to as a feed roller FR.

Next, the recording unit 15 will be described.
The recording unit 15 includes a guide shaft 42 disposed above the conveyance path, a carriage 43 supported by the guide shaft 42, and a recording head 44 as recording means supported by the carriage 43. Further, the recording unit 15 includes a support member 45 disposed at a position facing the recording head 44 with the conveyance path interposed therebetween.

  The guide shaft 42 is installed on the main body case 12 so as to extend along the width direction Y of the sheet ST intersecting (orthogonal) with the conveyance direction X. The carriage 43 reciprocates along the width direction Y while being guided by the guide shaft 42.

  A plurality of suction holes (not shown) are formed on the upper surface side of the support member 45, and the support member 45 has a built-in suction mechanism 46 for sucking the sheet ST through the suction holes. The recording head 44 is provided with a plurality of nozzles 47 that eject ink as liquid. Then, ink is ejected from the nozzles 47 of the recording head 44 onto the surface (upper surface in FIG. 1) of the sheet ST supported by the support member 45, whereby recording (printing) is performed on the sheet ST. Yes.

  Note that the printer 11 divides print data included in one print job into a plurality of pieces, performs print processing based on the divided print data for each scan of the carriage 43, and performs sheet ST between the print processing. The printed portion is intermittently conveyed. That is, in the recording unit 15, an image based on one print job is formed by alternately repeating the formation of a band-shaped image whose width direction Y is the longitudinal direction and paper feeding.

  Further, the cutting of the sheet ST by the cutter 16 is performed in a state in which the conveyance of the sheet ST by the conveyance device 14 is stopped and the upstream side is held by the suction mechanism 46 of the support member 45 while the downstream side is sandwiched between the conveyance roller pair R2. Done. In this embodiment, the sheet ST is cut when the conveyance of the sheet ST is stopped for printing. The cut sheet CS thus cut is continuously conveyed without being stopped by the conveying rollers 22 to 26, and after being reversed on the reversing path, the cut sheet CS is discharged to the paper discharge unit 12a.

Next, the curl correction mechanism 17 constituting a part of the transport device 14 will be described.
The curl correction mechanism 17 includes a transport roller 23 as a second drive roller, a transport roller 24 as a first drive roller, and a driven roller 34 as a curl correction roller as part of the constituent elements. The curl correction mechanism 17 includes a sensor 50, guide members 51 and 52 (see FIG. 2), a cam motor 53 (see FIG. 7), and a cam mechanism 60 (see FIG. 2).

  The sensor 50 is a reflective optical sensor electrically connected to the control device 100, has a light source unit and a light receiving unit (not shown), and is disposed at a position below the transport path forming member 38. . In the sensor 50, the light receiving unit receives reflected light of light emitted upward from the light source unit, and outputs an electrical signal corresponding to the intensity of the reflected light to the control device 100. For example, the sensor 50 outputs an ON value that is greater than a predetermined threshold when the sheet ST is a reflection target, and outputs an OFF value that is equal to or less than the threshold when the sheet ST is not a reflection target. . Therefore, when the output value of the sensor 50 changes from the OFF value to the ON value, the leading edge of the sheet ST in the transport direction X is detected.

  As shown in FIGS. 2 and 3, the transport rollers 22, 23, and 24 are respectively supported by shaft portions 22 a, 23 a, and 24 a that extend in the width direction Y. The driven rollers 32 and 34 are supported by shaft portions 32a and 34a extending in the width direction Y, respectively.

  As shown in FIGS. 4 and 5, a plurality (six in this embodiment) of driven rollers 32 are provided along the width direction Y. In the drawing, the three right-hand driven rollers 32 and the three left-hand driven rollers 32 are respectively connected by a connecting portion 32b. In addition, although illustration is abbreviate | omitted, the conveyance roller 22 is also provided along the width direction Y with the same number as the driven roller 32 (six in this embodiment). Further, a plurality (seven in this embodiment) of the transport rollers 23 and 24 are provided at intervals in the width direction Y. In addition, the driven roller 34 is provided with one small width near the center in the width direction Y, and one wide width roller is provided on each side (three in total).

  In the transport path forming member 38, insertion holes 38a are formed at positions corresponding to the driven roller 32 and the transport roller 22, respectively. The transport roller 22 and the driven roller 32 come into contact with each other through the insertion hole 38a. Further, a passage hole 38b for allowing the light of the sensor 50 to pass through is formed in the transport path forming member 38 at a position corresponding to the insertion hole 38a in the transport direction X and near the center in the width direction Y. Has been.

  As shown in FIG. 3, when the driven roller 34 sandwiches the sheet ST with the transport roller 24, the driven roller 34 is driven to rotate with the transport of the sheet ST and bends the sheet ST with the transport roller 23. By doing so, the curl of the sheet ST is corrected (decaled). The transport roller 23 is disposed on the upstream side of the transport roller 24 in the transport direction X and transports the sheet ST toward the transport roller 24. When the sheet ST is bent, the transport roller 23 is disposed upstream of the bent portion. It functions as a support part to support.

  As shown in FIGS. 2 and 3, the guide members 51 and 52 are arranged on the upstream side of the transport roller 24 in the transport direction X in order to guide the sheet ST toward the transport roller 24. The guide member 51 guides the back side (lower surface side) of the sheet ST conveyed by the conveyance roller 23, while the guide member 52 guides the front surface side (upper surface side) of the sheet ST conveyed by the conveyance roller 23. It is like that.

  2 to 6, the guide member 51 includes a base end portion 51a provided on the upstream side in the transport direction X, and a comb extending from the base end portion 51a toward the downstream side in the transport direction X. And a tooth-shaped guide portion 51b. 4 and 5, in the width direction Y, the guide portion 51b of the guide member 51 is disposed between the adjacent conveyance rollers 23 and at a position corresponding to the end portion of the sheet ST. ing. Further, the transport path forming member 38 is disposed on the upstream side in the transport direction X with respect to the guide portion 51 b of the guide member 51. Furthermore, as shown in FIG. 6, the guide portion 51 b of the guide member 51 is formed with a bent portion 51 c that bends away from the transport path forming member 38 toward the upstream side in the transport direction X.

  As shown in FIGS. 4 to 6, at the downstream end in the transport direction X of the transport path forming member 38, the displacement of the guide portion 51b is allowed at a position corresponding to the guide portion 51b of the guide member 51 in the width direction Y. For this purpose, a notch 38c is formed. In addition, in order to clarify the notch part 38c and the guide member 51, while the illustration of the guide member 52 is abbreviate | omitted in FIGS. 4-6, in FIG. 6, the conveyance rollers 22, 23, 24, the driven roller 32, and the cut sheet | seat Illustration of CS is omitted. Moreover, in FIG.4 and FIG.5, the cut sheet CS is shown with the dashed-two dotted line.

  As shown in FIGS. 2 and 3, the cam mechanism 60 includes a cam shaft 62 supported by the main body case 12, cam members 63 and 64 that rotate as the cam shaft 62 rotates, and cam members 63 and 64. Lever 65, 66 which follows each rotation is provided. The lever 65 is rotatable around a lever shaft 67 disposed on the upstream side of the cam shaft 62 in the transport direction X. The lever 66 is rotatable about a lever shaft 68 disposed on the downstream side of the cam shaft 62 in the transport direction X. As shown in FIG. 6, the cam members 63 and 64 and the levers 65 and 66 are provided on the end side in the width direction Y of the cam shaft 62.

  As shown in FIGS. 2 and 3, the lever 65 has a guide member 51 fixed to a support portion 65 a extending from the lever shaft 67 toward the downstream side in the transport direction X, and from the support portion 65 a in the transport direction X. An engaging portion 65 b extending obliquely downward toward the downstream side is engaged with the cam member 63. The lever 65 is biased counterclockwise in FIG. 2 by a biasing member (for example, a torsion coil spring) (not shown), and is always held in the state shown in FIGS.

  In the lever 66, an engaging portion 66 a extending downward from the lever shaft 68 is engaged with the cam member 64. In the lever 66, the shaft portion 34a of the driven roller 34 is rotatably supported on the distal end side of the support portion 66b extending upward from the lever shaft 68. A guide member 52 is fixed to the support portion 66 b of the lever 66. The lever 65 is urged counterclockwise in FIG. 2 by an urging force of an urging member (for example, a torsion coil spring) (not shown), and is always held in the state shown in FIGS. .

  The cam shaft 62 rotates as the cam motor 53 is driven. Then, when the cam shaft 62 rotates approximately 180 degrees from the state shown in FIG. 2, the cam members 63 and 64 together with the cam shaft 62 rotate to the position shown in FIG. Then, the lever 65 rotates counterclockwise in FIG. 2 according to the rotation of the cam member 63, and the lever 66 rotates in the clockwise direction in FIG. 2 according to the rotation of the cam member 64.

  When the cam shaft 62 rotates approximately 180 degrees from the state shown in FIG. 3 as the cam motor 53 is driven, the cam members 63 and 64 are rotated together with the cam shaft 62 to return to the position shown in FIG. Further, as the cam member 63 rotates, the lever 65 rotates in the clockwise direction in FIG. 3 to return to the position shown in FIG. 2, and as the cam member 64 rotates, the lever 66 rotates in the counterclockwise direction in FIG. Return to the position shown in FIG.

  The guide member 51 swings around the base end 51a side with the rotation of the lever 65, so that the guide portion 51b forms a transport path (the position shown in FIG. 2), and the guide portion 51b It is displaced between the retracted position (position shown in FIG. 3) that is separated from the transport path. In the guide position, the guide member 51 is configured such that the upper surface of the guide portion 51b on the tip side of the bent portion 51c is substantially flush with the upper surface of the transport path forming member 38 to form the support surface of the sheet ST. It has become. At this time, the bent portion 51 c of the guide member 51 is disposed in the notch 38 c of the transport path forming member 38.

  The driven roller 34 has a standby position (position shown in FIG. 2) in which the circumferential surface of the driven roller 34 is separated from the conveyance path along a movement path substantially along the circumferential surface of the conveyance roller 24 as the lever 66 rotates. Then, the sheet ST is sandwiched between the conveying roller 24 and moved between a correction position (position shown in FIG. 3) for correcting the curl. In the correction position, the driven roller 34 is disposed at a position where the separation distance from the transport roller 24 is shorter than the thickness of the sheet ST. Further, at the standby position, the driven roller 34 is disposed such that the separation distance from the transport roller 24 is longer than the thickness of the sheet ST. Therefore, when the driven roller 34 is at the standby position, the sheet ST is conveyed by the conveying roller 24 downstream along the conveyance path indicated by a two-dot chain line in FIG.

  As shown in FIG. 2, the guide member 51 has a length in the transport direction X that is longer than the diameter of the transport roller 23, and the guide portion 51 b extends to a position where the tip of the guide member 51 is applied to the transport roller 24. . In other words, the guide portion 51 b of the guide member 51 is arranged such that the downstream end in the transport direction X is downstream of the upstream end of the peripheral surface of the transport roller 24. Further, as shown in FIG. 3, the driven roller 34 has a mode in which the circumferential surface thereof intersects with the conveyance path indicated by a two-dot chain line in the drawing at the correction position. Therefore, the peripheral surface of the driven roller 34 in the correction position and the guide portion 51b of the guide member 51 in the guide position interfere with each other.

  In order to avoid such interference between the guide member 51 and the driven roller 34, in this embodiment, when the driven roller 34 moves downward toward the correction position, the guide member 51 moves from the correction position in the driven roller 34 to the standby position. It is possible to move to a retreat position that is spaced downward from the movement path. When the cam shaft 62 rotates, the guide member 51 moves with the rotation of the cam member 63, and the driven roller 34 moves with the rotation of the cam member 64. Therefore, the guide portion 51b of the guide member 51 moves downward from the guide position toward the retracted position at the timing when the driven roller 34 moves downward from the standby position toward the correction position.

Next, the electrical configuration of the printer 11 will be described.
As shown in FIG. 7, the control device 100 includes a computer 101 as a control means, a head drive circuit 102, and motor drive circuits 103, 104, and 105. The computer 101 is electrically connected to the head drive circuit 102 and the motor drive circuits 103, 104, and 105 via the bus 108.

  The computer 101 includes an ASIC 109 (Application Specific IC), a CPU 110, a ROM 111, a RAM 112, and a nonvolatile memory 113. The ROM 111 stores various control programs and various data. The nonvolatile memory 113 stores various programs including a firmware program and various data necessary for print processing. The RAM 112 temporarily stores program data executed by the CPU 110, various data that are calculation results and processing results by the CPU 110, various data processed by the ASIC 109, and the like.

  The computer 101 performs various controls by the CPU 110 executing a program stored in the ROM 111 or the like. For example, the computer 101 controls the recording head 44 via the head drive circuit 102 and controls the rotary motor 19, the transport motor 37 and the cam motor 53 via the motor drive circuits 103, 104 and 105, respectively. The computer 101 controls the transport motor 37 based on the detection signal from the rotary encoder 40. Further, the computer 101 controls the cam motor 53 based on the detection result of the sensor 50 and the like.

Next, curl correction processing in the printer 11 will be described.
In the printer 11, the curl correction process (decal process) is performed on the cut sheet CS cut after the recording process is completed. When the length of the cut sheet CS in the transport direction X is long, even after the leading end side of the sheet ST before being cut reaches the curl correction mechanism 17, the sheet ST is disposed after the sheet ST disposed in the recording unit 15. Recording processing may be performed on the end side.

  Therefore, normally, the sheet ST is conveyed without correcting the curl to the sheet ST in a state where the driven roller 34 is disposed at the standby position and the guide member 51 is disposed at the guide position. Then, after the cutting of the sheet ST is completed and continuous conveyance of the cut sheet CS is started, the driven roller 34 is moved from the standby position to the correction position under the control of the computer 101, and the curl correction processing of the sheet ST is performed. Be started.

  On the other hand, when the length of the cut sheet CS in the conveyance direction X is short, the leading end side of the cut sheet CS may not reach the curl correction mechanism 17 when cutting is performed. Even in such a case, in order to ensure that the leading edge of the cut sheet CS is inserted between the driven roller 34 and the transport roller 24, the computer 101 is provided with the sheet ST between the driven roller 34 and the transport roller 24 at the standby position. In the state in which is inserted, the driven roller 34 is moved from the standby position to the correction position.

Next, a curl correction processing routine executed by the computer 101 when cutting of the sheet ST is completed will be described with reference to FIG.
First, in step S11, the computer 101 acquires the length L in the conveyance direction X of the cut sheet CS, and proceeds to step S12.

  In step S12, based on the length L of the cut sheet CS acquired by the computer 101, the curl correction operation start count value Ns for determining the timing for starting the curl correction operation and the curl correction operation end for determining the timing for ending the curl correction operation. The count value Ne is determined, and the process proceeds to step S13.

  In step S13, the computer 101 determines whether or not the length L of the cut sheet CS is less than a predetermined threshold value La. The computer 101 proceeds to step S14 when the length L of the cut sheet CS is less than the threshold value La, and proceeds to step S15 when the length L of the cut sheet CS is equal to or greater than the threshold value La. . Note that the threshold value La can be defined in advance as a value for determining the length of the cut sheet CS and stored in the nonvolatile memory 113 or the like. For example, if the distance between the position where the sheet ST is cut in the transport direction X and the position where the sensor 50 detects the leading edge of the sheet ST is Lb (see FIG. 1), La ≦ Lb can be satisfied.

  In step S14, the computer 101 determines whether the sensor 50 has detected the leading edge of the cut sheet CS. When the sensor 50 detects the leading edge of the cut sheet CS, the computer 101 proceeds to step S16. On the other hand, when the sensor 50 has not detected the leading edge of the cut sheet CS, the computer 101 makes the same determination at a predetermined timing. repeat.

  In step S15, the computer 101 determines whether or not the leading end side of the cut sheet CS is nipped (clamped) by the feed roller FR. Then, the computer 101 proceeds to step S16 when the cut sheet CS is nipped by the feed roller FR, and repeats the same determination at a predetermined timing when the cut sheet CS is not nipped by the feed roller FR. .

  Note that whether or not the leading end side of the cut sheet CS is nipped by the feed roller FR can also be determined from the length L of the cut sheet CS and the transport amount of the cut sheet CS after cutting the sheet ST. Alternatively, if a leading end detection sensor is provided on the downstream side of the feed roller FR in the transport direction X, it is determined whether or not the leading end side of the cut sheet CS is nipped by the feed roller FR based on the detection result of the leading end detection sensor. You can also.

In step S16, the computer 101 starts counting and proceeds to step S17.
In step S17, the computer 101 determines whether or not the count value N is equal to or greater than the curl correction operation start count value Ns. Then, the computer 101 proceeds to step S18 when the count value N becomes equal to or greater than the curl correction operation start count value Ns, while when the count value N is less than the curl correction operation start count value Ns, a predetermined value is obtained. The same determination is repeated at the timing.

  In step S18, the computer 101 drives the cam motor 53 to start the curl correction operation, and the process proceeds to step S19. Specifically, by rotating the cam shaft 62 by approximately 180 degrees by driving the cam motor 53, the driven roller 34 is moved from the standby position to the correction position, and the guide member 51 is moved from the guide position to the retracted position. As a result, the cut sheet CS having the leading end inserted between the conveyance roller 24 and the driven roller 34 by the guide member 51 is bent in the direction opposite to the curl winding direction between the conveyance roller 23 and the curl is corrected. The

  In step S19, the computer 101 determines whether or not the count value N is equal to or greater than the curl correction operation end count value Ne. The computer 101 proceeds to step S20 when the count value N is equal to or greater than the curl correction operation end count value Ne, while the computer 101 proceeds to a predetermined value when the count value N is less than the curl correction operation end count value Ne. The same determination is repeated at the timing.

  In step S <b> 20, the computer 101 drives the cam motor 53 to end the curl correction operation, and the process ends. Specifically, the cam shaft 62 is rotated by approximately 180 degrees by driving the cam motor 53, whereby the driven roller 34 is moved from the correction position to the standby position, and the guide member 51 is moved from the retracted position to the guide position. That is, as the driven roller 34 moves from the correction position to the standby position, the guide member 51 moves from the retracted position to a guide position that guides the sheet ST to the transport roller 24 along the transport path.

  The cut sheet CS with the curl corrected is reversed in the process of being conveyed along the reverse path forming member 39, and is discharged to the paper discharge unit 12a with the printed surface facing downward. The Further, the driven roller 34 moves from the standby position spaced upward from the transport roller 24 to the correction position upstream of the standby position in the transport direction X when the cut sheet CS is sandwiched. Therefore, the decurled sheet ST is conveyed by the conveying roller 24 so that the leading end side that is the downstream side in the conveying direction X is inclined upward, and smoothly enters the reversing path.

According to the above embodiment, the following effects can be obtained.
(1) Since the conveyance roller 23 is arranged on the upstream side in the conveyance direction X of the conveyance roller 24, the conveyance roller 23 rotates to prevent the sheet ST from being caught even when the leading end side of the sheet ST is curled. It can suppress, and can convey reliably the front end side part of sheet | seat ST toward the conveyance roller 24 side. Therefore, compared to the case where the driven roller is disposed on the upstream side of the transport roller 24, the transport failure caused by the curl of the sheet ST is suppressed when the sheet ST is transported to perform the curl correction process. can do.

  (2) The driven roller 34 can correct the curl of the sheet ST when the sheet ST is sandwiched between the driven roller 34 and the conveying roller 24 at the correction position. Further, the driven roller 34 can pass the sheet ST without bending by moving from the correction position to the standby position. Therefore, when it is not necessary to correct the curl, the load when the sheet ST is conveyed can be reduced by moving the driven roller 34 to the standby position.

  (3) When the driven roller 34 moves to the correction position, the sheet ST is transported by the transport roller 24 so that the leading end, which is the downstream side in the transport direction X, is inclined upward. Can enter. Further, when the driven roller 34 is a driving roller, the leading end of the sheet ST heading upward is wound with the rotation of the driving roller. However, since the driven roller 34 is a driven roller, the sheet ST is the driven roller. It is possible to suppress wrapping around 34.

  (4) By moving the driven roller 34 to the standby position, the sheet ST can be smoothly inserted between the driven roller 34 and the conveying roller 24. Since the driven roller 34 is moved from the standby position to the correction position while the sheet ST is inserted between the driven roller 34 and the transport roller 24, the sheet ST can be securely held.

  (5) Since the sheet ST is guided along the transport path by the guide member 51 having the guide portion 51b extending in the transport direction X even if the front end is curled, the curled front end portion is separated from the transport path. It is conveyed to the conveyance roller 24 without doing. Then, when the driven roller 34 moves to the correction position, the guide member 51 can move to a retracted position away from the movement path from the correction position to the standby position in the driven roller 34, so that the driven roller 34 moves. Even in this case, interference with the driven roller 34 can be avoided. Accordingly, it is possible to suppress the occurrence of conveyance failure when the sheet ST before the curl is corrected is conveyed.

  (6) When the driven roller 34 moves from the correction position to the standby position, the guide member 51 moves from the retracted position to the guide position, and the sheet ST can be reliably guided to the transport roller 24 at the guide position.

  (7) Since the length of the guide member 51 in the transport direction X is longer than the diameter of the transport roller 23, it is possible to suppress the curled leading end portion of the sheet ST from being caught or wound around the transport roller 23. Since the downstream end of the guide member 51 in the transport direction X is disposed on the downstream side of the upstream end of the peripheral surface of the transport roller 24, the sheet ST can be used even when the leading end portion of the sheet ST is curled. Can be reliably guided to the peripheral surface of the transport roller 24.

  (8) Since the guide portion 51b of the guide member 51 is disposed between the conveyance rollers 23 adjacent to each other in the width direction Y, the guide portion 51b is disposed at a position corresponding to the end portion of the sheet ST in the width direction Y. By doing so, the end of the sheet ST can be reliably guided.

  (9) Since the guide member 51 swings around the base end 51a provided on the upstream side in the transport direction X, the guide 51b can be displaced without disturbing the transport of the sheet ST. And since the guide part 51b forms the comb-tooth shaped conveyance path | route in a guidance position, it can guide the sheet | seat ST, suppressing the sliding contact load with the sheet | seat ST. Further, since the notch 38c is provided in the transport path forming member 38, the gap between the transport path forming member 38 and the guide portion 51b can be reduced, and the sheet ST can be prevented from being caught in the gap.

  (10) Since the guide portion 51b of the guide member 51 is formed with a bent portion 51c, even if the leading end portion of the sheet ST conveyed from the upstream side is curled, the leading end portion is bent. It can guide to the front end side of the guide part 51b with the part 51c.

  (11) The guide member 51 can be moved to the retracted position at the timing when the driven roller 34 moves from the standby position to the correction position by interlocking the movement of the cam member 64 with the movement of the cam member 63.

In addition, you may change the said embodiment as follows.
The curl correction mechanism 17 may not include the guide members 51 and 52. In this case, the configuration of the curl correction mechanism 17 can be simplified.

  -It is good also as a structure which does not move the driven roller 34. FIG. Also in this case, for example, an urging member that urges the driven roller 34 in a direction close to the conveying roller 24 is provided, and when the leading end of the sheet ST is inserted between the conveying roller 24 and the driven roller 34, By making the urging force of the urging member weak, the sheet ST can be securely held.

The driven roller 34 may be configured to be movable to a plurality of correction positions and standby positions according to the thickness of the sheet ST, for example.
-The installation number of the conveyance rollers 22, 23, 24 and the driven rollers 32, 34, the size in the width direction Y, and the like can be arbitrarily changed.

The sensor 50 is not limited to an optical sensor, and can be changed to any type of sensor such as a contact sensor.
The feed roller FR may be provided at a position in the middle of the reverse path forming member 39.

  Without the feed roller FR or the reverse path forming member 39, for example, as shown in FIG. 9, the cut sheet CS is provided outside through the opening 12b provided in the main body case 12 without being inverted. You may make it discharge to the paper discharge part 12c. In this case, in the process in which the cut sheet CS is discharged from the opening 12b, the leading end side may be curled by its own weight as indicated by a two-dot chain line in the drawing. If only the front end side of the cut sheet CS with the curl corrected is curled in this way, the shape becomes unbalanced. In such a case, the curl is applied only to the rear end side of the cut sheet CS. Correction processing may be performed. As a result, like the cut sheet CS illustrated on the paper discharge unit 12c in the same figure, the front end side and the rear end side can be curled in opposite directions and can be formed in a well-balanced shape.

  In the above-described embodiment, the sheet ST is conveyed in a state where the leading end side is curled so as to be separated downward from the conveying path, but the leading end side of the sheet ST is curled in other directions (for example, upward or sideward). It may be transported by a. In this case, if the transport rollers 23 and 24 and the guide member 51 are disposed on the side where the leading end of the sheet ST curls across the transport path, the driven roller 34 is disposed at a position facing the transport roller 24. Good.

  The sheet ST is not limited to paper, and can be applied to any sheet-like medium that can be wound when held in a roll-like state such as a resin film or a metal film.

  The recording process is not limited to printing or printing, and may be various processes such as attaching a seal to a sheet-like medium, transferring a foil, making a hole, or making a cut. Then, the processing apparatus that performs each of these processes may be provided with the transport device of the present invention, and the curl may be corrected before the processes are performed, or the curl may be corrected after the processes are performed. .

  In the above-described embodiment, the recording apparatus adopting the inkjet method as the recording method is described. However, the recording device can be changed to a recording device of an arbitrary recording method such as an electrophotographic method or a thermal transfer method. Further, the recording apparatus is not limited to a printer, but may be a FAX apparatus, a copying apparatus, or a multifunction machine having a plurality of these functions. Further, as the recording apparatus, a liquid ejecting apparatus including a liquid ejecting head that ejects or ejects a small amount of liquid droplets other than ink may be employed. In addition, a droplet means the state of the liquid discharged from the said liquid ejecting apparatus, and shall also include what pulls a tail in granular shape, tear shape, and thread shape. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in a state in which the substance is in a liquid phase, such as a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And a liquid as one state of a substance, as well as a material in which particles of a functional material made of a solid such as a pigment or metal particles are dissolved, dispersed or mixed in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks. As a specific example of the liquid ejecting apparatus, for example, a liquid containing a material such as an electrode material or a color material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface emitting display, a color filter, or the like in a dispersed or dissolved state. It may be a liquid ejecting apparatus, a textile printing apparatus, or the like.

  DESCRIPTION OF SYMBOLS 11 ... Printer as recording apparatus, 13 ... Holding part, 14 ... Conveyance apparatus, 23 ... Conveyance roller as 2nd drive roller, 24 ... Conveyance roller as 1st drive roller, 34 ... Driven roller as curl correction roller, DESCRIPTION OF SYMBOLS 39 ... Reverse path formation member, 44 ... Recording head as recording means, 101 ... Computer as control means, RS ... Roll body, ST ... Sheet as sheet-like medium, X ... Conveying direction.

Claims (4)

A first drive roller that conveys the sheet-like medium from the upstream side to the downstream side in the conveyance direction along the conveyance path;
A second drive roller disposed upstream of the first drive roller in the transport direction and transporting the sheet-like medium toward the first drive roller;
When the sheet-like medium is sandwiched between the first driving roller, the sheet-like medium is driven to rotate as the sheet-like medium is conveyed, and the sheet-like medium is bent with the second driving roller. A curl correction roller for correcting the curl of the sheet-like medium;
A guide unit for guiding the medium;
The curl correction roller is disposed at a position facing the first drive roller across the conveyance path, and a correction position for sandwiching the sheet-like medium between the first drive roller and the curl correction The peripheral surface of the roller is movable between a standby position separated from the conveyance path,
The guide unit is arranged with a downstream end in a transport direction downstream from an upstream end of a peripheral surface of the first drive roller, and is displaced between a guide position and a retracted position. The transport apparatus according to claim 1 , wherein, when moving to the correction position, the transfer apparatus can move to the retreat position . A reversing path forming member disposed on the downstream side of the first drive roller in the transport direction and configured to reverse the sheet-like medium transported by the first drive roller;
The curl correction roller is movable between the standby position spaced upward from the first drive roller and the correction position upstream of the standby position in the transport direction. The transport apparatus according to claim 1 . A control means for controlling the movement of the curl correction roller;
The control means moves the curl correction roller from the standby position to the correction position with the sheet-like medium inserted between the curl correction roller and the first drive roller at the standby position. The conveying apparatus according to claim 1 or 2 , characterized by the above. A holding unit that holds the sheet-like medium in a roll-like state wound in a roll shape;
Recording means for recording the sheet-shaped medium unwound from the roll body;
Recording apparatus characterized by comprising a transport device according to any one of claims 1 to 3.

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